connected the antenna to the good channel Rx/TxThanks, I have been checking out your suggestions. What i meant by "negative Tx power" is that the Tx power is giving negative value (-30dbm) 1. I have upgraded to GNURadio >=3.8 but it is giving this warning message after trying to import QT GUI sink Block paths: /home/elect/gnuradio/share/gnuradio/grc/blocks Warning: restarting the docstring loader (crashed while loading 'qtgui_bercurve_sink') Warning: restarting the docstring loader (crashed while loading 'qtgui_const_sink_x') Warning: restarting the docstring loader (crashed while loading 'qtgui_edit_box_msg') Warning: restarting the docstring loader (crashed while loading 'qtgui_freq_sink_x') Warning: restarting the docstring loader (crashed while loading 'qtgui_histogram_sink_x') Warning: docstring loader crashed too often Pls, can you help to solve this problem? 2. For QT GUI Sink bandwidth, I will do that when the above problem is solved. 3. Yes I measured the signal power using a spectrum analyzer. 4. Did you check your signal amplitude at USRP bloc input? i don't know how to do this but check it when i solve the problem 5. yes, i connected the antenna to the good channel Rx/Tx.
On Fri, Mar 12, 2021 at 3:30 PM Christophe Seguinot < christophe.segui...@orange.fr> wrote: > Hi > > - What does "negative Tx power" means ? > > A few suggestions: > > - move to GNURadio >=3.8 (most of us uses GR 3.8 or 3.9 so it's > difficult to help for outdated GR 3.7) > - QT GUI Sink : Bandwith should be equal to sample rate of the block > incoming signal, i.e. samp_rate at the RRC Filter output (the FFT Sink does > not work as a real spectrum analyzer) > - Did you measure the signal power using a spectrum analyzer ? When do > so, the receiving antennna being close to the emitter antenna, you should > get the -20 to -30 dB as compared to the emitted power (frequency close to > 1GHz and 6dBi antennas (Indoor panel), this is depending on frequency and > antenna gain). If your emitted power is +20 dBm, you should measure > something in the range 0 dBm to -20 dBm. If not, there is something wrong > in the transmission chain. > - Did you check your signal amplitude at USRP bloc input (The maximum > value should be 1 Volt to get maximum RF power which also depend on USRP > settings > - Did you connected the antenna to the good channel Rx/Tx ? > > Sincerely, Christophe > On 12/03/2021 15:08, AKINYELE ITAMAKINDE wrote: > > Good day to all community members. > Please, I need you to help correct this flow graph configuration. The Tx > power radiating is too minimal. I have adjusted and also added some other > blocks to boost the signal but all to no avail. The flow graph is been used > for propagation channel measurement. I will like someone to take me through > or send video and other link on how to solve this problem. The flow graph > is attached. > Thank you. > Akinyele. > >
